package com.xxxx.comment.utils;

import cn.hutool.core.lang.UUID;
import com.xxxx.comment.service.ILock;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock {

    private String name;
    private StringRedisTemplate redisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate redisTemplate) {
        this.name = name;
        this.redisTemplate = redisTemplate;
    }
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true) + "-";

    private static final DefaultRedisScript<Long> addSeckillOrderScript;

    static {
        addSeckillOrderScript = new DefaultRedisScript<>();
        addSeckillOrderScript.setLocation(new ClassPathResource("/lua/7.6addSeckillOrder.lua"));
        addSeckillOrderScript.setResultType(Long.class);
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        // 获取线程标示
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        Boolean success = redisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX + name, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }


    @Override
    public void unlock() {
        // 调用lua脚本
        redisTemplate.execute(
                addSeckillOrderScript,
                Collections.singletonList(KEY_PREFIX + name),
                ID_PREFIX + Thread.currentThread().getId()
        );
    }

//    @Override
//    public void unlock() {
//        // 获取线程标示
//        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        // 获取锁中的标示
//        String id = redisTemplate.opsForValue().get(KEY_PREFIX + name);
//        // 判断标示是否一致
//        if(threadId.equals(id)) {
//            // 释放锁
//            redisTemplate.delete(KEY_PREFIX + name);
//        }
//    }
}
